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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ADT - Extension Details
Date Added: May 12, 2008
File Extension:  .ADT
Description 1: .ADT file extension is linked with Lingvo Dictionary file. Lingvo is a popular dictionary program in Russia due to its comprehensive, uptodate, easytouse and reliable dictionaries, as well as instant translation features. The Lingvo dictionary includes: general, specialized, professional, regional, explanatory dictionaries; thesaurus; dictionary of idioms and abbreviations; phrasebooks. Majority of these dictionaries are electronic versions of the most prominent and uptodate dictionaries in print. .ADT file extension and Lingvo are owned and developed by ABBY.
Description 2: .ADT file extension is linked with ACT! Document Template File. This is the file extension for the document template file utilized by ACT! a wellknown contact and customer manager designed to help users organize their contact information, enhance their communication for improved productivity and manage daily tasks. It integrates everyday usertools such as Microsoft Outlook, Word and Excel. .ADT file extension and ACT! are owned and developed by Best Software CRM Division.
File Type:   Document File
Mode: Binary
Program(s) to Open:  Windows: ACT!
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